90=4x-12+5x-7

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Solution for 90=4x-12+5x-7 equation: 



90=4x-12+5x-7

We move all terms to the left:

90-(4x-12+5x-7)=0

We add all the numbers together, and all the variables

-(9x-19)+90=0

We get rid of parentheses

-9x+19+90=0

We add all the numbers together, and all the variables

-9x+109=0

We move all terms containing x to the left, all other terms to the right

-9x=-109

x=-109/-9

x=12+1/9

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